AeroVeedramon

[When Digivolving] If you don't have a [Trial of the Four Great Dragons] in play, you may place 1 [Trial of the Four Great Dragons] from your hand in your battle area. [Opponent's Turn] While you have a Digimon with the [Four Great Dragons] trait in play, or [Trial of the Four Great Dragons] is in your battle area, this Digimon gains ＜Blocker＞ (This Digimon can block in the blocker timing.).

Inherited effect

[Opponent's Turn] All of your Digimon with the [Four Great Dragons] trait gain ＜Blocker＞ (This Digimon can block in the blocker timing.).